CNC metal manufacturing plays a vital role in providing high-quality production services and technical support for various industries, including transportation, technology, and more. Metal surface treatment is essential to achieve specific properties of parts and prolong their service life. Below are commonly used surface treatment processes for metal products, which can be evaluated and selected based on the specific use environment.



Anodizing is primarily applied to aluminum and aluminum alloy materials. Using electrochemical principles, an aluminum oxide film is formed on the surface, improving the product’s surface hardness, wear resistance, and corrosion resistance. Additionally, anodizing enhances the appearance of the parts. This process also reduces electrical conductivity, making it beneficial for applications where heat dissipation and reduced surface reflections are necessary.



Plating is suitable for all metallic materials and involves attaching a layer of metal film to the product surface. It enhances corrosion resistance, conductivity, and the overall appearance of the parts. Commonly used electroplating materials include gold, silver, nickel, zinc, and tin.



Electrophoresis is a process where dispersed particles move relative to a fluid under the influence of a spatially uniform electric field. This method is particularly useful for achieving high adhesion, preventing surface detachment, and producing a wide range of colors, making it suitable for treating complex structures.


Powder Coating:

Powder coating utilizes powder spraying equipment to apply a powdery coating onto the product surface. Static electricity causes the powder to be evenly adsorbed on the parts, and then the powder coating is baked at high temperatures for smoothing and curing. This process is cost-effective and often used in construction and industrial fields. It also has a strong ability to mask defects on the surface.



Grinding involves using grinding tools to create regular shallow lines on the surface of the parts. This process is effective in eliminating subtle flaws on the metal surface and achieving a decorative effect. Grinding can be categorized into different grain effects, including straight grain grinding, chaotic grain grinding, corrugated, and swirling grain, each offering distinct surface appearances.


Sand Blasting:

Sandblasting uses compressed air to generate a high-speed jet beam that sprays material onto the part’s surface, achieving a certain degree of cleanliness and roughness. This process improves adhesion for subsequent surface treatments and is commonly used to prepare surfaces for painting or coating.



Polishing involves using mechanical or chemical actions to reduce the surface roughness of the workpiece, resulting in a bright and smooth surface. Polishing does not alter the original physical properties of the material.


In conclusion, selecting the appropriate surface treatment for metal parts depends on the specific use environment and functional requirements. By carefully evaluating the properties offered by each treatment, manufacturers can optimize the performance, durability, and aesthetics of metal parts for their intended applications.